A wheel of moment of inertia 10 kg-m2 is rotating at 10 rotations per minute. The work done in increasing its speed to 5 times its initial value, will be (a) 100 J (b) 131.4 J (c) 13.4 J (d) …
(a) 1/R√{(8 mgh)/(M+4m)} (b) 1/R√{8 mgh/(M+m)} (c) 1/R√{mgh/(M+m)} (d) 1/R √{8 mgh/(M+2m)} Ans. a (27)